Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c116502e8e3f5d…

MALICIOUS

PDF

38.4 KB Created: 2020-08-30 03:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d702c87781958727fb76b29711960808 SHA-1: 61daab6d36c4284a00adc894a43878eea00d1a2c SHA-256: 77c116502e8e3f5d485ce84099b3a64a96c240125d744949905b27e0239c40b0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, one of which, 'https://ttraff.ru/wix?keyword=sembaruthi+serial+bgm+download', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL and appears to be a lure for downloading content. The presence of numerous other PDF links suggests a link farm or redirection strategy to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/wix?keyword=sembaruthi+serial+bgm+download
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/ac72e0_4bc43988108548e49a9a4c2ad0ff9aac.pdf
    • https://static.usrfiles.com/ugd/ddb60a_c3c7d26db8784ef6854fce469b4258e8.pdf
    • https://static.usrfiles.com/ugd/40512e_4d5f32944c7a49629c7a0352863cc0e2.pdf
    • https://static.usrfiles.com/ugd/fe83c3_dcbee2edd9b1423ca3adc417664df9c4.pdf
    • https://static.usrfiles.com/ugd/b8c837_da0e981594ba4776892747714e25d664.pdf
    • https://static.usrfiles.com/ugd/b8c837_5ad51b6408ef4ed9af97f2a90451d3d1.pdf
    • https://static.usrfiles.com/ugd/d1c05f_4ec9b5b753d64d2383c6372ace10a3a1.pdf
    • https://static.usrfiles.com/ugd/eaf48f_cf0d78843db142fc99cfc11bf9445d64.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_5103bf74acf04304acf2c9fd42fca8da.pdf
    • https://static.usrfiles.com/ugd/9b7d8a_450e8edab4f248e3b93c03538461acff.pdf
    • https://cdn.shopify.com/s/files/1/0427/4146/5244/files/bamitukerofalusutokej.pdf
    • https://cdn.shopify.com/s/files/1/0433/5285/0586/files/les_articles_contracts_ejercicios.pdf
    • https://cdn.shopify.com/s/files/1/0431/7360/9636/files/interface_in_python.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b2d.bin
3e55df4a70788e07351e903c1396b045562203b8638381164391b1f568502fd6
pdf-font-stream PDF embedded font (sfnt) at offset 0x4B2D 5456 bytes
font_01_sfnt_off00005d92.bin
9c8d051f0e18728465d0f29c2a17e553a06cf486fd5f47d74aa9bedb302e8134
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D92 9680 bytes
font_02_sfnt_off00007eb0.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EB0 4324 bytes